Atlantis

Atlantis was an island nation and city in Greek mythology, said to have been located in the Atlantic Ocean, which takes its name from the mythological island. The city was said to have later been drowned by the ocean and is said to be an underwater city.

History
Atlantis was said to have been the realm of Poseidon when the Hellenic gods divided the world between them; it was said to have been bigger than Ancient Libya and Asia Minor combined. Atlantis was an island in the middle of the present-day Atlantic Ocean (named for the city), with a strong general named Arkantos leading the Atlantean army during the Trojan War and in fighting off Kamos' Egyptian pirates.